类的变量/方法 & 实例的变量/方法
类的变量/方法 & 实例的变量/方法
# -*- coding: gb18030 -*-class Singleton(object): #变量在定义时候不区分“属于实例”还是“属于类”的 #在调用时候区分 # Singleton.__instance则是类的成员 # self.var则是实例的成员 __instance = None var = 3 #类的方法 def __new__(cls, *args, **kwd): if Singleton.__instance is None: print "singleton" #print "cls:", cls #print "args:", args #print "kwd:", kwd Singleton.__instance = object.__new__(cls, *args, **kwd) return Singleton.__instance #实例方法 def doSth(self): print "do sth", self.var #类的方法 def doSth2(self): print "do sth2", Singleton.varclass NonSingleton(object): __instance = None def __new__(cls, *args, **kwd): print "non singleton" NonSingleton.__instance = object.__new__(cls, *args, **kwd) return NonSingleton.__instance class MyClass(Singleton): passclass MyClass2(NonSingleton): passa=MyClass()b=MyClass()a.doSth()a.doSth2()a.var=4Singleton.var=5a.doSth()a.doSth2()c=MyClass2()d=MyClass2()
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